Improvement in devices for operating grate-bars



P. W. PRATT.

DEVICE FOR OPERATING GRATE-BARS.-

No.182,ZZ3. Patented Sept.12, 1876.

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N-PETERS, PHOTO-UTHOGRAPHER. WASHINGTON. D C.

PATENT PHILIP W. PRATT, OF ABINGTON, MASSACHUSETTS.

IMPROVEMENT IN DEVICES FOR OPERATING GRATE-BARS.

Specification formingpart of Letters Patent No. 182,223, dated September12, 1876; application filed l 1 December, 13, 1875.

To all whom it may concern:

Be it known that I, PHILIP W. PRATT, of Abington, in the county ofPlymouth and State of Massachusetts, have invented certain,

new and useful Improvements in Grate-Bars,

, of which the following is a specification:

tion being communicated by the action of a lever or some other suitabledevice worked by the fireman. a

Figure l is a plan showing two long bars of one set, and a few shortbars or projecting pieces of the other set. Fig. 2 is a verticalsectionof the same lengthwise of the grate. Fig. 3 is a cross verticalsection of the same. Fig. 4 shows in elevation one of the short bars orprojectors. Fig. 5 is a plan of a part of a long plate that servestohold the lower ends of the short bars-orprojectors.

Let A represent the walls of a furnace. B, Figs. 1, 2, and 3, is a flatcross-bar pivoted at b b, as shown in Figs. 1 and 2, so that it may havea rocking motion, the rocking motion being imparted to it by the leverD, Figs. 1 and 2. As the pivots'b are nearer to edge at than the edge01, it is evident that when the cross-bar B is rocked the motion of theedge (1 will be less than the motion of the edge d. The same may be saidof the rear crossbar B. Thegrate-bar H is provided with smallprojections h h, as shown. These bars H H are connected loosely to therocking cross-bars B B by the arms E, Fig. 2, so that when thecross-bars B and B are rocked the grate-bars H H move up and downvertically. L, Figs. 2, 3, and.5, is one of a series of longitudinalplates placed under the grate-bars, as shown. These plates are attachedto the rocking bars B and B by the arms F, Fig. 2. The arms F connectthe plate L to the edge d of the rockersB and B, so that the motion of Lis greater than the motion of the grate-bars H, when the rockers B and Bare moved. Between each turned in one direction this oblong enlargementcan pass through the hole M in the plate L, Fig. 5, the parts being soarranged that when the lower end of the projectoris passed through theplate L, and the said projector turned a quarter, it will be locked intothe plate L, as shown in Figs. 2 and 3. As the projectors K are attachedto the plate L, it is evident that they will move whenever the rockers Band B are moved, the arrangement being such that when'the projectors K Kare going down the grate-bars H will be going up, and vice versa. Theform and style of these bars may be varied to suit the requirements ofdifl'erent kinds of fuel. If desirable, a set of long bars may take theplace of the projectors K, or the long Y bars H may be omitted, and aseries of projectors substituted for them. The two rocking plates B andB are connected together by the rods P, as shown in Fig. 2.

I claim as my inventiona 1. The combination of the rocking plates B Band the rod P with the arms E E and bars H, all operating togethersubstantiallyas described, and for the purpose set forth.

2. The combination of the rocking plates B B and the rod P with theplate L, arms F, and projectionsK K, all operating togethersubstantially as described, and for the purpose set forth.

PHILIP W. PRATT.

